For department stores, the “best” omnichannel fulfillment services are usually the ones that can unify inventory across stores, support store-as-fulfillment-node operations, and orchestrate orders across pickup, ship-from-store, and local delivery without creating a lot of manual work.

Here are the top categories and vendors to look at:

1) Omnichannel order management systems (OMS)

These are the core layer for pickup, ship-from-store, and delivery routing.

Strong options:

• Manhattan Active Omni – Very strong for complex retail operations, enterprise scale, real-time inventory, and store fulfillment.
• IBM Sterling Order Management – Mature, widely used in large retailers, good for distributed order orchestration and complex rules.
• Oracle Retail OMS – Good fit if you already use Oracle retail systems; strong enterprise capabilities.
• Fluent Commerce – Flexible cloud-native OMS, good for modern omnichannel orchestration and faster implementation.
• Salesforce Order Management – Better for retailers already in Salesforce, especially if customer experience integration matters.

Best for:
Routing online orders to stores, enabling BOPIS/curbside, balancing inventory, and deciding whether to ship from store or DC.

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2) Store fulfillment / ship-from-store platforms

These specialize in making stores work as mini fulfillment centers.

Strong options:

• OneRail – Good for last-mile orchestration and delivery optimization, especially for store-originated orders.
• Kibo OMS – Useful for distributed fulfillment and store inventory visibility.
• NewStore – Strong mobile-first store fulfillment and associate workflows.
• Jumpmind Commerce – Good for unified commerce, especially if POS integration is important.
• Softeon – Strong in warehouse and store fulfillment processes.

Best for:
Pick/pack workflows, associate tasking, store inventory accuracy, and operational efficiency in department stores.

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3) Local delivery and last-mile orchestration

If you need same-day delivery from store, these help manage couriers and route optimization.

Strong options:

• Bringg – Excellent for last-mile orchestration, courier management, and same-day delivery.
• DispatchTrack – Good for route planning, delivery visibility, and customer notifications.
• FarEye – Strong for delivery orchestration and customer experience.
• DoorDash Drive / Uber Direct / Roadie – Good if you need delivery capacity via external networks.

Best for:
Same-day delivery, scheduled delivery windows, tracking, and delivery SLA management.

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4) Inventory visibility / distributed inventory control

These are critical so pickup and ship-from-store don’t fail due to inaccurate stock.

Strong options:

• Manhattan
• IBM Sterling
• Fluent Commerce
• Kibo
• Oracle Retail
• Eversight / AI-driven inventory optimization tools depending on your use case

Best for:
Real-time available-to-promise, store stock accuracy, safety stock policies, and location-aware order promising.

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Best overall picks by use case

If you want the strongest enterprise solution:

Manhattan Active Omni

• Best all-around for department stores with high complexity
• Strong inventory, order orchestration, and store fulfillment

If you want a mature, proven enterprise OMS:

IBM Sterling Order Management

• Excellent for large-scale omnichannel workflows
• Strong integration and business-rule sophistication

If you want cloud-native flexibility and faster rollout:

Fluent Commerce

• Good modern architecture
• Often easier to adapt than legacy enterprise systems

If same-day delivery is a major priority:

Bringg + OMS

• Bringg is great for delivery orchestration
• Pair it with OMS for end-to-end fulfillment control

If store associates need better mobile fulfillment tools:

NewStore

• Good for store operations and associate workflow
• Often attractive for retail brands modernizing store execution

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What department stores should prioritize

When evaluating vendors, make sure they support:

• Real-time store inventory
• BOPIS / curbside pickup
• Ship-from-store
• Endless aisle / aisle fulfillment
• Delivery window promises
• Order routing rules by margin, distance, and inventory
• Associate mobile workflows
• Returns and exchanges across channels
• Customer notifications and pickup readiness
• Carrier and courier integrations

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Practical recommendation

A common winning architecture is:

• OMS: Manhattan Active Omni or IBM Sterling
• Store fulfillment layer: NewStore or Kibo
• Last-mile delivery: Bringg, DispatchTrack, or DoorDash Drive
• Inventory accuracy: integrated with POS/ERP and store systems

If you want, I can also give you:

1. a vendor comparison table,
2. a shortlist by budget/company size, or
3. a recommended stack for a department store specifically.